The animation bar of the externally imported animation part of the object turns yellow, Does anyone understand this？
It’s a guess but I think it’s a deformable mesh/alembic animation. So one where you can’t really change parameters but you can change the duration if I’m right.
This is a Folder that contains one or more animation (nodes). A folder is similar to a group in the scene tree.
This screenshot should explains itself. The animation name represents the animation type:
Magenta and Orange bars shows imported animations and (as Oscar mentioned right) deformable meshes
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Deformable teeth, huh? 
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Must be some kind of vampire thing 
It was a TRex as alembic cache file
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That’s cool, haha. The name just caught my eye!